untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms of untreated

• crude
• unprocessed
• natural
• raw
• native

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

But for decades, sections of it have been plagued by the dumping of toxic chemicals and untreated sewage. —Rhea Mogul, CNN Money, 1 Feb. 2026

If traveling, be prepared for hazardous road conditions, especially on bridges and overpasses as well as on untreated roadways. —Nc Weather Bot, Charlotte Observer, 1 Feb. 2026

The snow will move quickly through Milwaukee, said National Weather Service meteorologist Kevin Wagner, but could still create hazards on untreated, elevated surfaces. —Hope Karnopp, jsonline.com, 1 Feb. 2026

Everyone had a role, and while there were many moments of instability due to the presence of untreated mental illness in her family, her mother was the braider. —Ambreia Meadows-Fernandez, Parents, 30 Jan. 2026

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease